TY  - JOUR
A1  - Lehmann, Andreas
A1  - Scheffler, Christiane
T1  - What does the mean menarcheal age mean?An analysis of temporal pattern in variability in a historical swiss population from the 19th and 20th centuries
T2  - American journal of human biology : the official journal of the Human Biology Council
N2  - ObjectivesAge at menarche is one of the most important factors when observing growth and development. The aim of this study was to assess the temporal pattern in variability of menarcheal age for a historic Swiss population from the 19th and 20th centuries. ResultsMean menarcheal age declined from 17.34 years (n=358) around 1830 to 13.80 years (n=141) around 1950. Within-cohort variance decreased from 7.5 to 2.1 year(2). Skewness was negatively correlated with birth year (r=-0.58). ConclusionThis study provided evidence for a secular trend in various statistical parameters for age at menarche since the 19th century. Furthermore, the results of the analysis of temporal pattern in variability revealed that the secular trend in menarcheal age happened in two phases. Am. J. Hum. Biol. 28:705-713, 2016. (c) 2016 Wiley Periodicals, Inc.
Y1  - 2016
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/44985
SN  - 1042-0533
SN  - 1520-6300
VL  - 28
SP  - 705
EP  - 713
PB  - Wiley-Blackwell
CY  - Hoboken
ER  -